Core-oven.



N0. 705,665. Patelited July 29, I902.

T. L. GR|FF|TH.

CORE OVEN.

(Application filed m 'gv, 1901.

' (No Model.)

UNITED STATES PATENT OFFICE.

THOMAS L. GRIFFITH, OF CINCINNATI, OHIO.

CORE-OVEN.

SPECIFICATION forming part of Letters Patent No. 705,665, dated July 29, 1902.

Application filed May 27, 1901.

{[ aZZ whom it may concern.-

Be it known that I, THOMAS L. GRIFFITH, a citizen of the United States of America, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Core-' Ovens, of which the following is a specification.

Myinventionis animprovementuponovens, for drying cores andparticularly relates to an improvement in portable drying-ovens that can be cheaply constructed,easily taken apart for shipment,readily set up for use, and which has fewer joints, more shelf-space for the cores to be dried'or baked, and in which the baked cores may be removed and the green cores inserted upon any of the shelves without permitting coldair to lower the temperature of the oven while the baked cores are being removed from any of the shelves and the green cores supplied to undergo the baking process. These objects I attain by the means illustrated in the accompanying drawings, in which like parts are indicated by similar reference-letters wherever they occur throughout the variousviews described in the specification referringto said parts, and particularly referred to and pointed out in the claims.

Referring to the drawings, Figure 1 is a top or plan view of my oven with one of the shelves thrown partially around. Fig. 2 isa front elevation with the shelf in the lower compartment thrown entirely around to remove or replace the cores and the compart went above it thrown partially around, as shown in plan view, Fig. 1, the doors in the upper compartments being shown closed. Fig. 3 is a vertical transverse section in detail of the heating-furnace and the lower plate of the oven, taken on line a a, Fig. 2. Fig. at is a plan View of the heating-furnace removed from the oven. Fig. 5 is a perspective view of the deflecting-plate placed upon the bottom of the oven over the furnace to equally distribute the gases arising from the furnace through oven andits grated shelves.

The body of the oven consists of a cast metal frame having uprights A and cross-bars A, the semicircular sheet-metal casing B, which is secured to the front frame in any suitable manner, the sheet-metal top B, hav- $eria1No.62,047. (No model.)

ing a thimble b on it to receive a pipe to carry off the gases after they have passed through the oven, and the sheet-metal bottom B whichhas a rectangular central perforation to allow the gases or products of combustion from the furnace to pass up into the oven.

To the under side of the bottom plate B are secured angle guide-bars 1), parallel with the sides of the angular opening in the bottom and to receive and act as guides for the overturned flanges c of the sides of the sheetmetal body 0 of the furnace. As seen in plan view, Fig. 4, the rear sheet-metal wall of the furnace-body has a rectangular flange c to extend beyond the opening in the bottom of the oven.

The furnace C may be of ordinary construction-so far as its internal arrangements are concerned. As I use it the front of itis made A of cast-ironprovided with the customary falldoor is provided with the customary register 0 to regulate the amount of atmospheric oxygen admitted to the ash-pit and through it to the fuel on the grate-bars. The inner body of the fire-box proper is provided with the customary fire-linings 0 There are no special novel features in the construction of this furnace except the means by which it is conveniently attached to my core-oven, and it is evident that the gases arising from the furnace would pass directly up from the furnace through the grated core-supporting shelves of the oven and thence outthrough the uptake; but in order to evenly distribute the heat from the furnace to all parts of the oven and grated shelves I have provided a perforated plate D, (shown in perspective in Fig.

- 5,) which is larger'than the rectangular opening in the'bottom of the core-oven. This plate is provided with legs (1, which rest on are provided with central perforated bosses a, and the doors E are also provided with central perforated bosses e, which register with the bosses at on the cross-bars or stiles of the oven-front. Through these perforated bosses is passed a pivot-rod F, upon which the doors swing to close the compartments in the oven whether the shelves are swung inward with the cores to be baked upon them or whether they are swung outward to remove the baked cores and replace green cores to be baked. The grated shelves Gare semicircular in plan View and have upwardly-projecting flanges or lugs g to receive fastening-bolts g, which permanently fix the grated shelves to the doors E.

The legs H are detachably secured to the bottom of the oven in any well-known mannerlike the ordinary stove leg, for instance-so that they, as well as the furnace, may be removed for shipment and the legs, if desired, placed upon the grated shelves to economize space in shipping.

Now it will be seen that when the fire is started in the furnace and the grated shelves, which are practically fixed to and supported by the bosses on the door, are swung inside the oven the whole oven is closed and no heat can escape. Ordinarily as the compartments of the oven are of different sizes the larger cores are introduced in the larger compartments and the lighter ones in the upper or smaller compartments. When itis desired to remove the cores from any of the compartments, the door is swung around to a halfcircle, bringing the grated shelves in front of the oven and closing the compartment, so that no heat can escape while the cores are being removed or green cores being replaced. When the green cores are replaced, the doors are swung around again, throwing the shelves on the inside and closing the compartment, so that no heat can escape or cold air be admitted while the shelves are being loaded or unloaded. There are handles or knobs e secured at one end of the door to start it around when the grated shelf is to be turned to the outside of the oven. It is found that only one of these handles is necessary, as when the shelf is started the door will swing to the closed "position; but, if desired, a similar handle may be placed on the inside of the door at the opposite edge to swing the door in the opposite direction in order to close the shelf within the oven.

It is obvious that many mere mechanical variations may be substituted for the device I have shown; but I have shown my portable oven in the form which experience has demonstrated to me to be the best; but I do not desire to be limited to the specific features of construction shown.

What I claim is 1. In a core-oven the front frames having shelf openings and perforated bosses arranged centrally on dividing cross-rails, the rear shell secured to the front frame, the bottom perforated to receive the heated gases from the furnace and the top perforated to allow the escape of the gases and vapors from the oven, the door for closing the front openings having centrallyperforated bosses in alinement with the bosses on the cross-rails of the front frame, the rod or shaft passing through said bosses centrally pivoting the doors to the front frame, the semicircular shelves secured to the inside of the doors, and the furnace for heating the oven, substantially as shown and described.

2. The hereinbefore described front for core-ovens consisting of the metal frame having openings to receive the core-supporting shelves, the cross-rails of said frame having centrally arranged perforated bosses, the doors for closing the openings in the frames having also centrally-perforated bosses in alinement with the bosses on the cross-rails of the frame,the vertical rod or shaft pivoting the doors to the front frame, and the semicircular shelves secured to the inside faces of the door.

3. In a portable core-oven the combination of the oven-body semicircular in cross-section the front of which has shelf-openings, the top perforated to permit the escape of gases and vapors, the bottom plate perforated to admit the gases from the furnace and having guides on its under side parallel with the side of said opening to receive the outwardlyturned flanges of the furnace, the doors for closing the front of the furnace centrally pivoted between the cross-rails of the furnacefront, the semicircular shelves secured to the inner faces of the doors, the furnace comprising the fire-chamber, ash-pit and suitable doors for the same, the top of the fire-chamber having lateral flanges to slide in the guides on the bottom of the oven, and the legs to support the oven-body, substantially as hereinbefore set forth.

4. In a core-oven the combination substantially as hereinbefore set forth of the ovenbody, the removable legs supporting it above the floor, the bottom of said oven-body having a rectangular perforation of substantially the size of the fire-chamber of the furnace, guides on the bottom of the oven to receive flanges projecting laterally from the top of the furnace, the furnace secured in said flanges, the centrally-pivoted doors in front of the oven-body, the semicircular shelves secured to the inner faces of said doors, the escape-openin g in the top of the oven and the perforated plate larger than the opening in the bottom of the oven and having legs at its corners to rest upon the bottom of the oven whereby the gases arising from the furnace are evenly distributed through the oven-body and core-shelves before reaching the escape or pipe at the top of the oven.

THOMAS L. GRIFFITH. Witnesses:

W. F. MURRAY, EMMA LYFORD. 

